Use API references

src/main/java/com/alttd/playershops/handler/ShopHandlerImpl.java

@@ -1,6 +1,7 @@
 package com.alttd.playershops.handler;
 
 import com.alttd.playershops.PlayerShops;
+import com.alttd.playershops.api.Shop;
 import com.alttd.playershops.api.ShopHandler;
 import com.alttd.playershops.config.Config;
 import com.alttd.playershops.shop.AbstractShop;
@@ -22,7 +23,7 @@ public class ShopHandlerImpl implements ShopHandler {
     @Getter
     private final Object2IntMap<UUID> shopBuildLimits;
     @Getter
-    private final Map<Location, AbstractShop> shopLocation;
+    private final Map<Location, Shop> shopLocation;
     @Getter
     private final ArrayList<Material> shopMaterials;
 
@@ -34,7 +35,7 @@ public class ShopHandlerImpl implements ShopHandler {
         shopMaterials = new ArrayList<>(); // TODO move into parent method where materials are loaded in.
     }
 
-    public AbstractShop getShop(Location location) {
+    public Shop getShop(Location location) {
         Location newLocation = new Location(location.getWorld(), location.getBlockX(), location.getBlockY(), location.getBlockZ());
 
         return shopLocation.get(newLocation);
@@ -44,7 +45,7 @@ public class ShopHandlerImpl implements ShopHandler {
         return getShop(location) != null;
     }
 
-    public Collection<AbstractShop> getShops() {
+    public Collection<Shop> getShops() {
         return Collections.unmodifiableCollection(shopLocation.values());
     }
 
@@ -67,24 +68,24 @@ public class ShopHandlerImpl implements ShopHandler {
         return shopMaterials.contains(block.getType());
     }
 
-    public List<AbstractShop> getShops(UUID uuid) {
-        List<AbstractShop> shops = new ArrayList<>();
-        for (AbstractShop shop : shopLocation.values()) {
+    public List<Shop> getShops(UUID uuid) {
+        List<Shop> shops = new ArrayList<>();
+        for (Shop shop : shopLocation.values()) {
             if (shop.getOwnerUUID().equals(uuid))
                 shops.add(shop);
         }
         return shops;
     }
 
-    public AbstractShop getShopBySignLocation(Location signLocation) {
-        for (AbstractShop shop : shopLocation.values()) {
+    public Shop getShopBySignLocation(Location signLocation) {
+        for (Shop shop : shopLocation.values()) {
             if (shop.getSignLocation().equals(signLocation))
                 return shop;
         }
         return null;
     }
 
-    public AbstractShop getShopNearBlock(Block block) {
+    public Shop getShopNearBlock(Block block) {
         BlockFace[] faces = {BlockFace.NORTH, BlockFace.SOUTH, BlockFace.EAST, BlockFace.WEST};
         for (BlockFace face : faces) {
             if (this.isShopMaterial(block.getRelative(face))) {